/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla File API.
 *
 * The Initial Developer of the Original Code is
 *   Kyle Huey <me@kylehuey.com>
 * Portions created by the Initial Developer are Copyright (C) 2011
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#ifndef nsDOMBlobBuilder_h
#define nsDOMBlobBuilder_h

#include "nsDOMFile.h"
#include "CheckedInt.h"

#include "mozilla/StandardInteger.h"

using namespace mozilla;

class nsDOMMultipartFile : public nsDOMFileBase,
                           public nsIJSNativeInitializer
{
public:
  // Create as a file
  nsDOMMultipartFile(nsTArray<nsCOMPtr<nsIDOMBlob> > aBlobs,
                     const nsAString& aName,
                     const nsAString& aContentType)
    : nsDOMFileBase(aName, aContentType, UINT64_MAX),
      mBlobs(aBlobs)
  {
  }

  // Create as a blob
  nsDOMMultipartFile(nsTArray<nsCOMPtr<nsIDOMBlob> > aBlobs,
                     const nsAString& aContentType)
    : nsDOMFileBase(aContentType, UINT64_MAX),
      mBlobs(aBlobs)
  {
  }

  // Create as a blob to be later initialized
  nsDOMMultipartFile()
    : nsDOMFileBase(EmptyString(), UINT64_MAX)
  {
  }

  NS_DECL_ISUPPORTS_INHERITED

  // nsIJSNativeInitializer
  NS_IMETHOD Initialize(nsISupports* aOwner,
                        JSContext* aCx,
                        JSObject* aObj,
                        PRUint32 aArgc,
                        jsval* aArgv);

  typedef nsIDOMBlob* (*UnwrapFuncPtr)(JSContext*, JSObject*);
  nsresult InitInternal(JSContext* aCx,
                        PRUint32 aArgc,
                        jsval* aArgv,
                        UnwrapFuncPtr aUnwrapFunc);

  already_AddRefed<nsIDOMBlob>
  CreateSlice(PRUint64 aStart, PRUint64 aLength, const nsAString& aContentType);

  NS_IMETHOD GetSize(PRUint64*);
  NS_IMETHOD GetInternalStream(nsIInputStream**);

  // DOMClassInfo constructor (for Blob([b1, "foo"], { type: "image/png" }))
  static nsresult
  NewBlob(nsISupports* *aNewObject);

  virtual const nsTArray<nsCOMPtr<nsIDOMBlob> >*
  GetSubBlobs() const { return &mBlobs; }

protected:
  nsTArray<nsCOMPtr<nsIDOMBlob> > mBlobs;
};

class BlobSet {
public:
  BlobSet()
    : mData(nsnull), mDataLen(0), mDataBufferLen(0)
  {}

  nsresult AppendVoidPtr(const void* aData, PRUint32 aLength);
  nsresult AppendString(JSString* aString, bool nativeEOL, JSContext* aCx);
  nsresult AppendBlob(nsIDOMBlob* aBlob);
  nsresult AppendArrayBuffer(JSObject* aBuffer, JSContext *aCx);
  nsresult AppendBlobs(const nsTArray<nsCOMPtr<nsIDOMBlob> >& aBlob);

  nsTArray<nsCOMPtr<nsIDOMBlob> >& GetBlobs() { Flush(); return mBlobs; }

protected:
  bool ExpandBufferSize(PRUint64 aSize)
  {
    if (mDataBufferLen >= mDataLen + aSize) {
      mDataLen += aSize;
      return true;
    }

    // Start at 1 or we'll loop forever.
    CheckedUint32 bufferLen = NS_MAX<PRUint32>(mDataBufferLen, 1);
    while (bufferLen.valid() && bufferLen.value() < mDataLen + aSize)
      bufferLen *= 2;

    if (!bufferLen.valid())
      return false;

    // PR_ memory functions are still fallible
    void* data = PR_Realloc(mData, bufferLen.value());
    if (!data)
      return false;

    mData = data;
    mDataBufferLen = bufferLen.value();
    mDataLen += aSize;
    return true;
  }

  void Flush() {
    if (mData) {
      // If we have some data, create a blob for it
      // and put it on the stack

      nsCOMPtr<nsIDOMBlob> blob =
        new nsDOMMemoryFile(mData, mDataLen, EmptyString(), EmptyString());
      mBlobs.AppendElement(blob);
      mData = nsnull; // The nsDOMMemoryFile takes ownership of the buffer
      mDataLen = 0;
      mDataBufferLen = 0;
    }
  }

  nsTArray<nsCOMPtr<nsIDOMBlob> > mBlobs;
  void* mData;
  PRUint64 mDataLen;
  PRUint64 mDataBufferLen;
};

class nsDOMBlobBuilder : public nsIDOMMozBlobBuilder,
                         public nsIJSNativeInitializer
{
public:
  nsDOMBlobBuilder()
    : mBlobSet()
  {}

  NS_DECL_ISUPPORTS
  NS_DECL_NSIDOMMOZBLOBBUILDER

  nsresult AppendVoidPtr(const void* aData, PRUint32 aLength)
  { return mBlobSet.AppendVoidPtr(aData, aLength); }

  nsresult GetBlobInternal(const nsAString& aContentType,
                           bool aClearBuffer, nsIDOMBlob** aBlob);

  // nsIJSNativeInitializer
  NS_IMETHOD Initialize(nsISupports* aOwner,
                        JSContext* aCx,
                        JSObject* aObj,
                        PRUint32 aArgc,
                        jsval* aArgv);
protected:
  BlobSet mBlobSet;
};

#endif
